Study on Batch Separation Processing of Maternal and Fetal Bioelectrical Signals

抄録

Bioelectrical signals obtained from the abdominal wall of pregnant women include maternal and fetal electrocardiogram (mECG / fECG), electrohysterogram (EHG), and electromyogram (EMG) from abdominal smooth muscle group. In this study, we investigate batch separation process and analysis among these signals.

Four active electrodes on the upper, lower, left, and right sides of the maternal abdomen and reference/ground settled above the pubic bone.

Front-end of AP108 (Miyuki Giken) was used with 1kHz sampling. Normal CTG (cardiotocograph) was simultaneously recorded. MODWT (Maximum overlap discrete wavelet transform) and inverse MODWT (Maximum overlap discrete wavelet inverse transform) on MATLAB were applied.

mEGG, fECG, EHG, and EMG regions were sequentially extracted and processed in a time-series manner.

EHG signals were successfully separated form the maternal smooth muscle EMG associated with contractions after the 2nd stage of labor. Proposed method must be a promising way for monitoring labor output (contractions and abdominal pressure) during delivery.